What does the TechT iFIT kit do? It allows you to precisely match your bore to the size of your paintball, resulting in ridiculous accuracy increases and tighter shot grouping, using ANY barrel and ANY gun - all you need to do is buy the correct kit for your gun, and you can use the iFIT kit to improve your accuracy! TechT's 6 Piece iFIT Kit comes with the barrel thread of your choice as well as the following 6 inserts: .685, .682, .679, .676, .673, .670. The iFIT also comes with a durable plastic case to protect your inserts. The case is filled with laser cut foam to help protect your inserts from damage.